Can't build JavaScript universal Windows app

I have started a new project - javascript - windows universal app and without changing anything or adding any code I try to build it and run it but it wont with the following error:

Error : DEP0700 : Registration of the app failed. error 0x80080204: App manifest validation error: The document root element m:Package must be defined in the http://schemas.microsoft.com/appx/2010/manifest namespace. (0x80080204) App7

A similar issue was reported here and I tried renewing the license with project -> store -> aquire developer license to no avail. It seems to be that the actual problem has to be the document root element part which I'm not really familiar with as I haven't worked with Visual Studio before I tried to add xmlns:m="http://schemas.microsoft.com/appx/2010/manifest" to my package appxmanifest but that doesn't seem to have helped.

Heres the whole manifest:

<?xml version="1.0" encoding="utf-8"?>
<Package
  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
  xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
  xmlns:m="http://schemas.microsoft.com/appx/2010/manifest"
  IgnorableNamespaces="uap mp m">

  <Identity
    Name="155dc546-80c7-4275-b2a6-a2aa8ddec5f7"
    Version="1.0.0.0"
    Publisher="CN=FroboZ" />

  <mp:PhoneIdentity PhoneProductId="155dc546-80c7-4275-b2a6-a2aa8ddec5f7" PhonePublisherId="00000000-0000-0000-0000-000000000000"/>
  <Properties>
    <DisplayName>App7</DisplayName>
    <PublisherDisplayName>FroboZ</PublisherDisplayName>
    <Logo>images\storelogo.png</Logo>
  </Properties>

  <Dependencies>
    <TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.10069.0" MaxVersionTested="10.0.10069.0" />
  </Dependencies>

  <Resources>
    <Resource Language="x-generate" />
  </Resources>

  <Applications>
    <Application
      Id="App"
      StartPage="default.html">

      <uap:VisualElements
        DisplayName="App7"
        Description="App7"
        BackgroundColor="#464646"
        Square150x150Logo="images\Logo.png"
        Square44x44Logo="images\SmallLogo.png">

        <uap:SplashScreen Image="images\splashscreen.png" />

      </uap:VisualElements>
    </Application>
  </Applications>

  <Capabilities>
    <Capability Name="internetClient" />
  </Capabilities>

</Package>

Thank you for taking your time to read my question and even more so if you can help me with this problem!

Developer mode wasn't turned on in windows 10. I'm not sure what difference this makes but after turning this on I was able to build the project.